diff --git a/ChangeLog b/ChangeLog
index 1b5e595..ab6e910 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-24 Doug Simons <doug.simons@testplant.com>
+
+	* Source/win32/WIN32Server.m: Ignore duplicate mouse down
+	events generated by first click in a window.
+
 2010-03-19 Eric Wasylishen <ewasylishen@gmail.com>
 
 	* Headers/win32/w32_movesize.h:
diff --git a/Source/win32/WIN32Server.m b/Source/win32/WIN32Server.m
index 2427cd1..ccd1475 100644
--- a/Source/win32/WIN32Server.m
+++ b/Source/win32/WIN32Server.m
@@ -1994,6 +1994,10 @@ process_mouse_event(WIN32Server *svr, HWND hwnd, WPARAM wParam, LPARAM lParam,
     || (eventType == NSRightMouseDown)
     || (eventType == NSOtherMouseDown))
     {
+      // It seems Windows generates duplicate mouse down events on first click in a window
+      if (ltime == lastTime) // duplicate event has identical time
+	return nil; // ignore it
+
       if (lastTime + GetDoubleClickTime() > ltime)
         {
           clickCount += 1;